Convert Apache redirect map to NGINX format

convert-redirects.sh

#!/bin/bash

# copy file 1 to file 2, and overwrite file 2 if necessary
yes | cp $1 ${2}-tmp

# %g/^#/normal dd  # Deletes all comments
# %normal Elcw  # Collapses whitespace between segments
# %normal A;  # Adds semicolon to the end of each line
# %g/\S\/\;/normal f;hx  # Removes trailling slash for second segment
# %g/\/ /normal Ex  # Removes trailing slash for first segment
# %normal Vgu  # Lower cases all characters
# wq  # Save file and quit

# open vim and run the above ex commands
# awk '!x[$0]++'  # remove duplicate lines without sorting

vim ${2}-tmp -c "%g/^#/normal dd" \
  -c "%normal Elcw " \
  -c "%normal A;" \
  -c "%g/\S\/\;/normal f;hx" \
  -c "%g/\/ /normal Ex" \
  -c "wq" 

cat ${2}-tmp | awk '!x[$0]++' > $2
rm ${2}-tmp